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沉积学报  2015 

渭河盆地古近系细屑岩的古盐度分析

DOI: 10.14027/j.cnki.cjxb.2015.03.006, PP. 480-485

Keywords: 渭河盆地,古近系,古盐度,CIA

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Abstract:

渭河盆地位于鄂尔多斯地块与秦岭造山带之间,古近纪主要出露地层为红河组及白鹿塬组,由于近些年在盆地新生界地层中发现氦气前景,有必要对其沉积环境进行研究,本文通过野外样品的主量元素、微量元素的测定,运用Adams法、Walker相当硼法、B/Ga、Sr/Ba比值法定量—半定量地分析了渭河古近系沉积时的盐度特征,同时结合化学蚀变指数CIA值的变化特征,对古近系沉积环境进行了综合分析,结果表明渭河盆地古近系红河组、白鹿塬组盐度为2.2‰~11.7‰,为一内陆淡水湖泊,整体气候温暖湿润,局部地区干旱,并出现咸水沉积环境;同时发现蚀变指数CIA与盐度值成负相关关系,由红河组湖相环境至白鹿塬组河流及三角洲相为主的沉积环境,风化指数升高,而B/Ga比值所反映的盐度值降低。CIA值在一定程度上反映了盐度特征,由于生物富集作用导致样品出现高Sr值,使得Sr/Ba比值在反映盐度时出现异常点。

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